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AS5040 Datasheet(PDF) 6 Page - ams AG

Part # AS5040
Description  10 BIT 360째 PROGRAMMABLE MAGNETIC ROTARY ENCODER
Download  28 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS5040 Datasheet(HTML) 6 Page - ams AG

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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Revision 1.6, 03-Oct-06
www.austriamicrosystems.com
Page 6 of 28
Even
PAR
CSn
CLK
DO
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
18
16
COF
LIN
OCF
Mag
INC
Mag
DEC
1
t
CLK FE
Angular Position Data
Status Bits
T
CLK/2
t
DO active
t
DO valid
D
2
D9
D8 D7
1st Device
2nd Device
3
Angular Position Data
Figure 6: Daisy Chain mode data transfer
5
Incremental Outputs
Three different incremental output modes are possible
with quadrature A/B being the default mode.
Figure 7 shows the two-channel quadrature as well as
the step / direction incremental signal (LSB) and the
direction bit in clockwise (CW) and counter-clockwise
(CCW) direction.
5.1
Quadrature A/B Output
(Quad A/B Mode)
The phase shift between channel A and B indicates the
direction of the magnet movement. Channel A leads
channel B at a clockwise rotation of the magnet (top
view) by 90 electrical degrees. Channel B leads channel
A at a counter-clockwise rotation.
5.2
LSB Output (Step / Direction Mode)
Output LSB reflects the LSB (least significant bit) of the
programmed incremental resolution (OTP Register Bit
Div0, Div1). Output Dir provides information about the
rotational direction of the magnet, which may be placed
above or below the device (1=clockwise; 0=counter
clockwise; top view). Dir is updated with every LSB
change.
In both modes (quad A/B, step/direction) the resolution
and the index output are user programmable. The index
pulse indicates the zero position and is by default one
angular step (1LSB) wide. However, it can be set to three
LSBs by programming the Index-bit of the OTP register
accordingly (see Table 6).
Counterclockwise ccw
A
B
Step / Dir-Mode
Quad A/B-Mode
Index=0
1LSB
Index=1
3 LSB
Ind ex
Mechanical
Zero Position
LSB
Dir
Rotation Direction
Change
CSn
t Incremental outputs valid
t Dir valid
Hyst =
2 L S B
Clockwise cw
Mechanical
Zero Position
Figure 7: Incremental output modes


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